:root {
    --primary-blue: #2c5f8a;
    --primary-blue-dark: #1e3f5a;
    --secondary-blue: #eef4fa;
    --light-gray: #f4f6f9;
    --medium-gray: #e1e5ea;
    --border-gray: #d1d6dc;
    --text-dark: #1e2a3a;
    --text-muted: #6c757d;
    --white: #ffffff;
    --success-green: #28a745;
    --danger-red: #dc3545;
    --warning-orange: #fd7e14;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
    --radius: 6px;
}
* { margin:0; padding:0; box-sizing:border-box; }
body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--light-gray);
    color: var(--text-dark);
    line-height: 1.5;
}
.container { max-width: 1400px; margin:0 auto; padding:20px; }
.header {
    background: var(--white);
    border-bottom: 1px solid var(--border-gray);
    padding: 1rem 2rem;
    margin-bottom: 2rem;
    box-shadow: var(--shadow-sm);
    border-radius: var(--radius);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
}
.header h1 { font-size:1.5rem; font-weight:600; color:var(--primary-blue); }
.nav-menu {
    background: var(--white);
    padding: 0.75rem 1rem;
    border-radius: var(--radius);
    margin-bottom: 2rem;
    box-shadow: var(--shadow-sm);
    display: flex;
    flex-wrap: wrap;
    gap: 0.25rem;
}
.nav-menu a {
    color: var(--text-dark);
    text-decoration: none;
    padding: 0.5rem 1rem;
    border-radius: var(--radius);
    font-size: 0.9rem;
    font-weight: 500;
    transition: all 0.2s;
}
.nav-menu a:hover { background: var(--secondary-blue); color: var(--primary-blue); }
.card {
    background: var(--white);
    border-radius: var(--radius);
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-gray);
}
.card-header {
    border-bottom: 1px solid var(--border-gray);
    padding-bottom: 1rem;
    margin-bottom: 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
}
.card-header h2 { font-size:1.25rem; font-weight:600; color:var(--primary-blue); }
.form-group { margin-bottom:1.25rem; }
.form-group label { display:block; margin-bottom:0.5rem; font-weight:500; font-size:0.9rem; }
.form-control {
    width:100%;
    padding:0.6rem 0.8rem;
    border:1px solid var(--border-gray);
    border-radius: var(--radius);
    font-size:0.95rem;
    transition: border-color 0.2s;
}
.form-control:focus { outline:none; border-color:var(--primary-blue); box-shadow:0 0 0 2px rgba(44,95,138,0.1); }
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.6rem 1.2rem;
    border: none;
    border-radius: var(--radius);
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    text-decoration: none;
}
.btn-primary { background: var(--primary-blue); color: white; }
.btn-primary:hover { background: var(--primary-blue-dark); }
.btn-secondary { background: var(--medium-gray); color: var(--text-dark); }
.btn-secondary:hover { background: var(--border-gray); }
.btn-danger { background: var(--danger-red); color: white; }
.btn-success { background: var(--success-green); color: white; }
.table { width:100%; border-collapse: collapse; font-size:0.9rem; }
.table th { background: var(--secondary-blue); color: var(--primary-blue); font-weight:600; padding:0.8rem; text-align:left; border-bottom:1px solid var(--border-gray); }
.table td { padding:0.8rem; border-bottom:1px solid var(--border-gray); vertical-align:middle; }
.table tr:hover { background: var(--light-gray); }
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}
.stat-card {
    background: var(--white);
    padding: 1.2rem;
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
    border-left: 4px solid var(--primary-blue);
}
.stat-value { font-size:1.8rem; font-weight:700; color:var(--primary-blue); }
.stat-label { color: var(--text-muted); font-size:0.85rem; margin-top:0.25rem; }
.alert { padding:0.8rem 1rem; border-radius: var(--radius); margin-bottom:1.5rem; font-size:0.9rem; }
.alert-success { background:#d4edda; color:#155724; border:1px solid #c3e6cb; }
.alert-error { background:#f8d7da; color:#721c24; border:1px solid #f5c6cb; }
@media print {
    .nav-menu, .btn, .form-group, .card-header .btn, .no-print { display:none; }
    .card { border:none; box-shadow:none; padding:0; }
    body { background:white; }
    .container { padding:0; margin:0; }
}